Pace tracking way off (slow) in first few minutes

Hi,

Hoping someone has experienced the same issue as i'm having with my Fenix 5 Plus.  For the first 2/3 minutes, the pace on my Fenix is tracking way down on actual pace.  It tends to come down gradually to my actual pace but regularly starts from 15/20 mins per mile and it works down to 7/8.  Now this only seems to happen very local to my house as starting runs elsewhere don't have this issue.  Weirdly, i have an Edge 520 and this doesn't seem to have an issue around my house but perhaps this might be down to my speed going away from that locality.  I've checked satellite signals and it seems quite consistent.

Anyone else out there having similar problems or know of a solution???